Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Cumulative Preferred Stock [Member]	Cumulative Convertible Preferred Stock [Member]	Participating Convertible Preferred Stock [Member]	Series 2003 Convertible Preferred Stock [Member]	Common Class A [Member]	Common Class B [Member]	Retained Earnings [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balances at Mar. 31, 2020							$ 459,797	$ 681	$ 3,041	$ 98,384	$ (88,319)	$ (79,220)
Net earnings							20,706	0	0	0	0	0
Cash dividends declared on preferred stock							(12)	0	0	0	0	0
Equity incentive program							0	0	0	28	0	0
Net earnings							20,706	0	0	0	0	0
Cash dividends declared on preferred stock							(12)	0	0	0	0	0
Balances at Jun. 27, 2020							480,491	681	3,041	98,412	(88,319)	(79,220)
Balances at Mar. 31, 2020							459,797	681	3,041	98,384	(88,319)	(79,220)
Net earnings													$ 38,811
Purchase treasury stock					$ (1,200)
Net earnings													38,811
Balances at Sep. 26, 2020							498,596	681	3,041	98,436	(89,482)	(79,220)	432,052
Balances at Jun. 27, 2020							480,491	681	3,041	98,412	(88,319)	(79,220)
Net earnings							18,105	0	0	0	0	0	18,105
Equity incentive program							0	0	0	24	0	0
Purchase treasury stock							0	0	0	0	(1,163)	0
Net earnings							18,105	0	0	0	0	0	18,105
Balances at Sep. 26, 2020							498,596	681	3,041	98,436	(89,482)	(79,220)	432,052
Balances at Mar. 31, 2021							585,874	663	3,041	98,502	(91,198)	(19,067)	577,815
Net earnings							14,136	0	0	0	0	0
Cash dividends declared on preferred stock							(12)	0	0	0	0	0
Equity incentive program							0	0	0	25	0	0
Purchase treasury stock							0	0	0	0	(4,552)	0
Net earnings							14,136	0	0	0	0	0
Cash dividends declared on preferred stock							(12)	0	0	0	0	0
Balances at Jul. 03, 2021							599,998	663	3,041	98,527	(95,750)	(19,067)
Balances at Mar. 31, 2021							585,874	663	3,041	98,502	(91,198)	(19,067)	577,815
Net earnings													25,790
Purchase treasury stock					$ (17,300)
Net earnings													25,790
Balances at Oct. 02, 2021							611,652	662	3,041	98,558	(108,507)	(19,067)	586,339
Balances at Jul. 03, 2021							599,998	663	3,041	98,527	(95,750)	(19,067)
Net earnings							11,654	0	0	0	0	0	11,654
Equity incentive program							0	0	0	30	0	0
Purchase treasury stock							0	0	0	0	(12,757)	0
Preferred stock conversion							0	(1)		1	0	0
Net earnings							11,654	0	0	0	0	0	11,654
Balances at Oct. 02, 2021							$ 611,652	$ 662	$ 3,041	$ 98,558	$ (108,507)	$ (19,067)	$ 586,339
Preferred stock, shares authorized (in shares)	200,000	1,400,000	33,756	500
Common stock, shares authorized (in shares)					20,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	200,000	807,240	33,756	500
Common stock, shares outstanding (in shares)					7,014,873	1,705,938